Elongated article with good flexibility and high flame retardancy

ABSTRACT

The invention relates to elongated articles and polymer compositions used for preparing the elongated articles. The elongated articles comprise an inner structure/one or more elements including a static/moving current medium or communication medium; and a halogen-free polymer composition surrounding the element(s). The polymer composition includes a linear very low density polyethylene (VLDPE) composition and one or more polyolefin-elastomers. In addition, the polymer composition includes a flame retardant filler.

The invention relates to elongated articles as defined in the claims andpolymer compositions as defined in the claims used for preparing theelongated articles. Elongated articles which are halogen-free but haveflame retardance properties are used in various applications such as inapplications in the vicinity of inflammable goods or in applicationswhere high safety standards have to be met.

The challenges in the development of elongated articles are related tothe various industrial requirements which have to be met. Theseindustrial requirements concern flame retardance properties, sheathing(mechanical protection), elongation at break, strength at break,flexibility, stripping force, low friction, and resistance to scratches.In order to improve one or the other property, an infinite number ofpolymer materials and polymer additives are available. However, while itmay be possible to improve one or the other parameter by routinedevelopment, changing the polymer composition in this course results inthe deterioration of at least one other parameter. Since it is notpredictable how the above parameters will vary, if the polymercomposition is changed, many approaches have been tried to fulfill theindustrial requirements for elongated articles.

BACKGROUND PRIOR ART

EP1102282 A1 discloses devices surrounded by an inner and an outerlayer. The outer layer provides chemical resistance and abrasivity([0011]) and the inner layer provides flame retardancy and highelongation and tensile strength ([0011]). One example of an inner layeris Rezeptur 7 in Table 1 of page 6. The layers are described asproviding a high elongation. In order to provide a desired adhesivenessbetween the layers, the layers can comprise block copolymers. However,as shown in Example 2 herein, block copolymers do not provide thehighest elongation at break. Furthermore, EP1102282 A1 does not teachthe relevance of the type of polyolefines regarding the elongationproperties.

Compositions comprising polyolefin elastomers (POE) in combination witha high density polyethylene (HDPE) and a polyethylene having a densityof below 0.910 g/cm³ as well as a flame retardant, a coupling agent, anda stabilizer are known in the art. Using a combination of HDPE and VLDPE(very low density polyethylene) is known for achieving good elongationproperties. However, the use of HDPE is neither required nor desirablein the context of the present invention.

Other known polymer compositions may provide an elongation of only up toabout 300%. Such compositions may include an ultra-high molecular weightpolysiloxane.

DE3633056 A1 teaches that VLDPEs increase the resistance to thermaldistortion (claim 5). It neither discloses nor suggests using acombination of the particular VLDPE and particular polyolefin-elastomerof the present invention for providing a polymer composition having ahigh content of flame retardant filler.

WO 2010015876 A1, WO 2013030795 A1, and WO 2007032573 A1 disclosecompositions which have an elongation at break below only 200%.

WO 2002026879 A1 discloses a halogen-free polymeric compositionincluding: (a) at least two metallocene catalysed olefin polymers and/orcopolymers wherein at least one of the olefin polymers and/or copolymersis elastomeric; and (b) an effective amount of at least one filler whichis capable of providing the polymeric composition with flame retardantproperties substantially similar to that of plasticised PVC (see claim1). The composition includes at least about 30 PHR of at least onemetallocene catalysed polyolefin elastomer (POE). For more flexiblecompositions, even higher POE contents are suggested. The presentinvention does not require such high POE contents in order to providethe desired elongation properties.

WO 2008014597 A1 and WO 2010024602 A2 disclose compositions having anelongation of up to about 800%. However, these compositions do notcontain high levels of fillers which are flame retardants.

It is therefore an object of the present invention to provide elongatedarticles having good long term mechanical stability and flameretardancy, in particular low flammability, good resistance to pressureat high temperatures (mechanical protection), high elongation at break,good dimensional stability, high strength at break, and highflexibility. Other properties which may be good relate to the waviness(which is related to the intensity of the spiral appearance of a cablesurface predefined by the twisted cores), stripping force for removal ofthe polymer composition from the elements, low friction, and resistanceto scratches.

SUMMARY OF THE INVENTION

The invention relates to an elongated article comprising:

(i) one or more elements including a medium with static/movingcharge/current (or electric charge) or communication medium; and(ii) a halogen-free polymer composition surrounding the element(s),wherein said polymer composition is obtainable or obtained bycompounding and extrusion of at least the following components onto (i):(a) 24-26.5 wt.-% of a linear very low density polyethylene (VLDPE)composition having a density in the range from 0.85 g/cm³ to 0.93 g/cm³,and having a melting point of above 110° C.;(b) 9.5-13 wt.-% of one or more polyolefin-elastomers, wherein thepolyolefin-elastomer(s) is/are (an) ultra-low density randomethylene-octene copolymer(s) having a glass transition temperature ofbelow −50° C., and/or a melting point of below 40° C.; and(c) 61-66 wt.-% of flame retardant filler, which is a mineralhydroxide/hydrated metal-based filler.

The invention further relates to an elongated article comprising:

(i) an inner structure; and(ii) a polymer composition or compound surrounding the inner structure,wherein the polymer composition comprises a mixture of a linear very lowdensity polyethylene (VLDPE) composition, a polyolefin-elastomer, whichis an ultra-low density random ethylene-octene copolymer, a mineralhydroxide/hydrated metal-based filler flame retardant filler, anantioxidant and a coupling agent composition; and wherein the polymercomposition has(aa) an elongation at break in the range from 150% to 500%, as measuredby IEC 60811-501; and/or(bb) a strength at break in the range from 7.5 MPa to 15.0 MPa, asmeasured by IEC 60811-501.

The invention further relates to a polymer composition obtainable orobtained by compounding at least the components as defined in (ii)above.

Elongated articles comprising elements surrounded by a polymercomposition have to fulfill various demands. First of all, it must bepossible to prepare the devices in an economic manner by using standardmanufacturing devices such as extruders. Therefore, the polymercomposition has to be suitable for being applied to and/or onto theinner elements by way of HFFR (Halogen-Free Flame Retardant) extrusion.

During use, elongated articles are subjected to bending movements andpull force conditions for a very high number of times such as severalhundreds of bending movements and pull force conditions over thelifetime of said devices. Under such extreme conditions, polymers usedas the material for surrounding the structure of the elongated articlescan break. In order to avoid breaking of the polymer coat, theflexibility of the polymers is increased. However, several otherproperties also have to be fulfilled by the elongated articles andincreasing the flexibility of the polymers can result in deteriorationof other properties (cf. experimental section hereinafter). For example,flexibility of the polymer can be increased by reducing the content offlame retardant filler, resulting in reduced flame retardancy. At thesame time, the degree of indentation in the hot pressure test mayincrease, since the increased flexibility reduces the dimensionalstability.

Further difficulties arise if halogen-free flame retardants are used.Avoiding halogens is desirable, because halogenated flame retardantshave many drawbacks, since they partially decompose during processing ofthe polymer and create bubbles, or if the polymer catches fire duringuse, giving rise to halogenated fumes that are toxic and corrosive.However, to impart sufficient flame retardancy, high levels ofhalogen-free flame retardants/fillers have to be used. Such high levelsof filler lead to a reduction in processability and in mechanical andelastic properties of the resulting polymer composition, in particularas regards impact resistance, elongation, flexibility and stress atbreak.

The various parameters which have to be met by elongated articles arepreset by the industry on the basis of various standards, which arementioned herein.

For example, the elongated articles have to comply with the hot pressuretest in order to have good mechanical resistance to higher temperatures,i.e., have to provide correct values under the respective testconditions (<50% ENSO 363) in accordance with IEC 60811-508 (4 hrs @80°C.). Although the single/pure components of polymer composition, such asthe polyolefin elastomers, may fail the hot pressure test when tested ontheir own, the extruded multicomponent polymer composition may pass thehot pressure test. Accordingly, in order to meet the hot pressure test,it is not possible to simply select starting materials which pass thehot pressure test, expecting that this property will be retained in themulticomponent extruded polymer composition.

The main challenge, however, is the alternate bending test or also knownfrom persons skilled in the art as “Two pulley flexing test” (EN 50396)which is cost and time consuming. A test specimen has to be subjected to30000 test cycles. For performing the test, a fully industriallyproduced prototype is needed. Therefore, it is rather a validation test,after the final development, but not a test which can be used foroptimizing the polymer composition.

The most important parameters which define the suitability and qualityof an elongated article are: Flame retardancy which complies with thetest for vertical flame propagation according to EN 60332-1-2 (which iscost and time consuming because the test is executed on the finalproduct as well as on the polymer composition), good resistance topressure at high temperatures (mechanical protection) (hot pressuretest, ISO 6722), high elongation at break (IEC 60811-501), gooddimensional stability (hot pressure test, ISO 6722), high strength atbreak (IEC 60811-501), and high flexibility (alternate bending test, EN50396). Other properties which may be good relate to the waviness, lowfriction, resistance to scratches, and stripping force.

Since an infinite number of polymers, monomers and polymer additives areavailable, it is impossible to randomly prepare and test polymersregarding their parameters. Furthermore, as explained above, it is notpossible to optimize one parameter after another, since changing thepolymer composition influences all parameters positively or negativelyat the same time. In other words, it is difficult to find the “sweetspot”, where all parameters are balanced at an acceptable or best level.It is not even possible to determine in advance, whether a particularcombination of starting materials is suitable for providing an extrudedpolymer composition which meets all industrial standards.

It has therefore unexpectedly been found that the polymer compositionsof the present invention represent such a “sweet spot”, where all oressentially all above industrial requirements may be complied with. Thepolymer compositions are characterized by a combination of a specificlinear very low density polyethylene (VLDPE) composition and a specificultra-low density random ethylene-octene copolymer(polyolefin-elastomer) at high levels of HFFR filler. The “sweet spot”is defined by the specific combination of materials and the narrowlydefined window for the amounts thereof. As demonstrated by the examplesherein, working outside this “sweet spot” results in deterioration ofone or more parameters.

As seems to be suggested by the examples, a high elongation at break andgood performance in the alternate bending test can even be obtained whenusing very high levels of HFFR fillers. The use of a randomethylene-octene copolymer seems to be superior to the use of a blockoctene copolymer regarding elongation at break. A comparison betweencompositions 3 and 4 (cf. examples 3 and 4) seems to suggest that theuse of a propylene-based elastomer does not provide a very highelongation as is obtained when using a random ethylene-octene copolymeras the polyolefin-elastomer. Likewise, the use of an ethylene vinylacetate copolymer instead of the specific VLDPEs does not allowproviding a high elongation at break and does not allow passing the hotpressure test (cf. example 5). Example 6 seems to suggest that the useof a random ethylene-octene copolymer is superior to the use of anα-olefin copolymer regarding elongation at break. Example 7 seems tosuggest that a low amount of VLDPEs in combination with an amorphouspropylene-ethylene copolymer, in addition to a block octene copolymer asthe polyolefin-elastomer, does not allow passing the hot pressure test.Example 8 seems to suggest that the use of a higher amount of POE butlower amount of VLPDEs does not allow passing the hot pressure test.

Thus, the invention relates to elongated articles and polymercompositions for preparing same as defined in the claims, wherein saidelongated articles and polymer compositions allow complying with all oressentially all industrial standards referred to herein.

DETAILED DESCRIPTION

The invention relates to the following items:

1. Elongated article comprising:(i) one or more elements including a medium with static/movingcharge/current (or electric charge) or communication medium; and(ii) a halogen-free polymer composition surrounding the element(s),wherein said polymer composition is obtainable or obtained bycompounding and extrusion of at least the following components ontocomponent (i), i.e. the one or more elements:(a) 24.0-27.0 wt.-% of a linear very low density polyethylene (VLDPE)composition having a density in the range from 0.85 g/cm³ to 0.93 g/cm³,as measured according to ISO 1183, and having a melting point of above110° C., e.g., determined by differential scanning calorimetry (DSC)measurement;(b) 8.0-15.0 wt.-% of one or more polyolefin-elastomers, wherein thepolyolefin-elastomer(s) is/are (an) ultra-low density randomethylene-octene copolymer(s) having a glass transition temperature ofbelow −50° C. as determined in the polymer composition or in pure form,wherein the determination of the melting point will be provided, e.g.,from the DSC measurement, and/or a melting point of below 40° C. asdetermined in the polymer composition or in pure form, wherein thedetermination of the melting point will be provided on basis of e.g.,the DSC measurement, wherein, by way of example, Engage® 8842 of Dow hasa very low melting point of 38° C.; and(c) 61-66 wt.-% of flame retardant filler, which is a mineralhydroxide/hydrated metal-based filler.2. The elongated article according to item 1, wherein the polymercomposition further comprises: (d) 0.1-3.0 wt.-% of an antioxidant; and(e) 0.5-2.5 wt.-% of a coupling agent composition.3. The elongated article according to item 1 or 2, wherein the polymercomposition has (aa) an elongation at break in the range from 200% to400%, preferably 300% to 400%, as measured by IEC 60811-501, preferablymeasured by using the elongated article without the one or moreelements, and/or(bb) a strength at break in the range from 7.5 MPa to 12.0 MPa, or 8.0MPa to 10.0 MPa, preferably 9.0 MPa to 10.0 MPa, preferably beforeageing, as measured by IEC 60811-501 and as required by DIN EN 50363-8.During ageing, the samples are placed into an oven for 7 days at 80° C.,then put into a desiccator and then tested. The deviation in elongationand tensile strength is preferably not bigger than ±20%. Unlessotherwise stated, all values referred to herein are measured withoutageing.4. The elongated article according to any preceding item, wherein thelinear very low density polyethylene composition is/comprises a mixtureof two different types of linear very low density polyethylenecompositions, preferably a mixture of 18-23 wt.-% of a firstcomposition, preferably having a density in the range from 0.85 g/cm³ to0.95 g/cm³, preferably of about 0.9 g/cm³, as measured according to ISO1183, and 2.0-6.5 wt.-% of a second composition, preferably having adensity in the range from 0.85 g/cm³ to 0.95 g/cm³, preferably of about0.9 g/cm³, as measured according to ISO 1183. Preferably, the VLDPE,which is present in a higher amount, has a higher melt flow ratecompared with the other VLDPE. Preferably, the VLDPE being present in anamount of 2.0-6.5 wt.-% has a melt flow index of 2-5, as measuredaccording to ASTM1238 (190° C./2.16 kg; g/10 min), while the VLDPE beingpresent in an amount of 18-23 wt.-% has a melt flow index of 8-15, asmeasured according to ASTM1238 (190° C./2.16 kg; g/10′).5. The elongated article according to any preceding item, wherein thelinear very low density polyethylene composition has a density in therange from 0.85 g/cm³ to 0.92 g/cm³, preferably in the range from 0.85g/cm³ to 0.90 g/cm³, as measured according to ISO1183.6. The elongated article according to any preceding item, wherein thepolyolefin-elastomer has a density in the range from 0.80 g/cm³ to 0.90g/cm³, preferably of about 0.859 g/cm³, as measured according to ASTMD792.7. The elongated article according to any preceding item, wherein thepolyolefin-elastomer (composition) has an elongation at break of atleast 1000%, further preferred at least 1100%, most preferably about1200%, as measured by ASTMD638.8. The elongated article according to any preceding item, wherein thepolyolefin-elastomer has a value of ShoreD hardness of less than 20, asmeasured by ASTM D2240 (compression molded sample, wherein a sample ofthe polyolefin-elastomer is molded into a plate). The value of ShoreDhardness of the elongated article/polymer composition preferably is32-38.9. The elongated article according to any preceding item, wherein thepolymer composition is applied by hot-melt extrusion at a temperature inthe range from 100° C. to 175° C., preferably 100-170° C.10. The elongated article according to any preceding item, wherein theflame retardant filler is fine precipitated hydrated metal-based filler,e.g., aluminum hydroxide or magnesium hydroxide, preferably having about99.4% purity. One example of such filler is Martinal® OL-104 LEO.11. The elongated article according to any preceding item, wherein thecoupling agent composition is a mixture of vinyltriethoxysilane and1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane.12. The elongated article according to any preceding item, wherein theantioxidant is a phenolic antioxidant, preferablytetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane.13. The elongated article according to any preceding item comprisingfrom 1 to 8 elements, each having diameters of up to 4.0 mm, such asdiameters from 0.5 to 4.0 mm, and preferably having from 2 to 5elements. The static/moving current media or communication media of theelements can be a metal wire, wherein the wire can be one piece ofmetal, preferably the wire is further stranded. The wire can besurrounded by a polymer layer to form the element.14. The elongated article according to any preceding item, wherein thepolymer composition does not contain a plasticizer.15. The elongated article according to any preceding item, wherein thepolymer composition does not contain a high density polyethylenehomopolymer having a density of 0.94 g/cm³ or higher, preferably notcontaining a high density polyethylene homopolymer having a density of0.92 g/cm³ or higher.16. The elongated article according to any preceding item, wherein thepolymer composition does not contain a polysiloxane.17. The elongated article according to any preceding item, wherein thepolymer composition surrounds the elements to provide a sheath formechanical protection of the elements.18. The elongated article according to any preceding item, wherein, theglass transition temperature of the polyolefin-elastomer/ultra-lowdensity random ethylene-octene copolymer is −58° C.19. The elongated article according to any preceding item, wherein thepolymer composition is not UV crosslinked.20. The elongated article according to any preceding item, having an MFIof at least 9 g/10 min, preferably 10-12 g/10 min, further preferredabout 11 g/10 min, as measured according to EN ISO 1133 under theconditions at 150° C. and the load of 21.6 kg.21. The elongated article according to any preceding item, wherein thedensity of the polyolefin-elastomer/ultra-low density randomethylene-octene copolymer is in the range from 0.80 g/cm³ to 0.90 g/cm³,as measured according to ISO 1183.22. The elongated article according to any preceding item, wherein thepolymer composition has a value of ShoreD hardness of 32-38, preferably35-37, further preferred about 36.23. The elongated article according to any preceding item, wherein thelinear very low density polyethylene (VLDPE) composition having amelting point above 110° C., preferably has a melting point which isbelow 120° C. measured and/or determined by the method of DSCmeasurement.24. The elongated article according to any preceding item, wherein thelinear very low density polyethylene (VLDPE) composition has a Vicattemperature (Vicat softening temperature) of above 50° C., for example,measured according to the ASTM D1525 method.25. The elongated article according to any preceding item, which passesthe alternate bending test (EN 50396).26. Polymer composition obtainable or obtained by compounding at leastthe components (a)-(c), preferably also components (d) and (e) asdescribed herein.27. Elongated article, in particular elongated article of any of items1-25, comprising:(i) an inner structure, preferably comprising one or more elements asdescribed herein, preferably as defined in any of items 1, 13, and 17;and(ii) a polymer composition surrounding the inner structure, wherein thepolymer composition comprises a mixture of a linear very low densitypolyethylene (VLDPE) composition, a polyolefin-elastomer, which is anultra-low density random ethylene-octene copolymer, a mineralhydroxide/hydrated metal-based filler flame retardant filler, anantioxidant and a coupling agent composition; and wherein the polymercomposition has(aa) an elongation at break in the range from 150% to 500%, or 300% to400%, preferably >340%, such as >340% to 400%, as measured by IEC60811-501; and/or(bb) a strength at break in the range from 7.5 MPa to 15.0 MPa, or 8.0MPa to 12.0 MPa, preferably 9.0 MPa to 10.0 MPa, as measured by IEC60811-501, preferably before ageing.28. The elongated article according to item 27, or elongated article ofany of items 1-27, wherein the linear very low density polyethylene(VLDPE) composition is contained in an amount of 24.0-26.5 wt.-%, andhas a density in the range from 0.86 g/cm³ to 0.93 g/cm³, as measuredaccording to ISO 1183, and having a melting point of above 110° C.,e.g., measured by the differential scanning calorimetry (DSC).29. The elongated article according to item 27 or 28, or elongatedarticle of any of items 1-25, wherein the polyolefin-elastomer consistsof one or more polyolefin-elastomers which are contained in an amount of9.5-13.0 wt.-%.30. The elongated article according to item 29, or elongated article ofany of items 1-29, wherein the polyolefin-elastomer(s) is/are (an)ultra-low density random ethylene-octene copolymer(s) having a glasstransition temperature of below −50° C. as determined in the polymercomposition or in pure form, wherein the melting point is, e.g.,determined by DSC measurement, and/or having a melting point of below40° C. as determined in the polymer composition or in pure form, whereinthe melting point is, e.g., determined by DSC measurement, wherein, byway of example, Engage® 8842 of Dow has a very low melting point of 38°C.31. The elongated article according to any preceding item, or elongatedarticle of any of items 1-30, wherein the flame retardant filler ispresent in an amount of 61-66 wt.-%.32. The elongated article according to any preceding item, or elongatedarticle of any of items 1-31, wherein the polymer composition furthercomprises: 0.1-3.0 wt.-% of an antioxidant; and 0.5-2.5 wt.-% of acoupling agent composition.33. The elongated article according to any preceding item, or elongatedarticle of any of items 1-32, wherein the polymer composition has(aa) an elongation at break in the range from 300% to 500%,preferably >340% to 450%, or 350% to 400%, as measured by IEC 60811-501,preferably measured by using the elongated article without the innerstructure, and/or(bb) a strength at break in the range from 8 MPa to 15 MPa, preferablybefore ageing, as measured by IEC 60811-501 and as required by DIN EN50363-8, preferably measured by using the elongated article without theinner structure.34. The elongated article according to any preceding item, or elongatedarticle of any of items 1-33, wherein the linear very low densitypolyethylene composition comprises a mixture of two different types oflinear very low density polyethylene compositions, preferably a mixtureof 18-23 wt.-% of a first composition, preferably having a density inthe range from 0.85 g/cm³ to 0.95 g/cm³, preferably of about 0.9 g/cm³,as measured according to ISO 1183, and 2.0-6.5 wt.-% of a secondcomposition, preferably having a density in the range from 0.85 g/cm³ to0.95 g/cm³, preferably of about 0.9 g/cm³, as measured according to ISO1183. Preferably, the VLDPE, which is present in a higher amount, has ahigher melt flow rate compared with the other VLDPE. Preferably, theVLDPE being present in an amount of 2.0-6.5 wt.-% has a melt flow indexof 2-5 as determined according to ASTM1238 (190° C./2.16 kg; g/10 min),while the VLDPE being present in an amount of 18-23 wt.-% has a meltflow index of 8-15 as determined according to ASTM1238 (190° C./2.16 kg;g/10′).35. The elongated article according to any preceding item, or elongatedarticle of any of items 1-34, wherein the linear very low densitypolyethylene composition has a density in the range from 0.85 g/cm³ to0.92 g/cm³, preferably in the range from 0.85 g/cm³ to 0.90 g/cm³, asmeasured according to ISO1183.36. The elongated article according to any preceding item, or elongatedarticle of any of items 1-35, wherein the polyolefin-elastomer has adensity in the range from 0.80 g/cm³ to 0.90 g/cm³, preferably of about0.859 g/cm³, as measured according to ASTM D792.37. The elongated article according to any preceding item, or elongatedarticle of any of items 1-37, wherein the polyolefin-elastomer(composition) has an elongation at break, preferably measured by usingthe elongated article without the inner structure, of at least 1000%,further preferred at least 1100%, most preferably about 1200%, asmeasured by ASTM D638.38. The elongated article according to any preceding item, or elongatedarticle of any of items 1-37, wherein the polyolefin-elastomer has avalue of ShoreD hardness of less than 20, as measured by ASTM D2240(compression molded sample, wherein a sample of the polyolefin-elastomeris molded into a plate). The value of ShoreD hardness of the elongatedarticle/polymer composition preferably is 32-38.39. The elongated article according to any preceding item, or elongatedarticle of any of items 1-38, wherein the polymer composition is appliedby hot-melt extrusion at a temperature in the range from 100° C. to 175°C., preferably 100-170° C.40. The elongated article according to any preceding item, or elongatedarticle of any of items 1-39, wherein the flame retardant filler is fineprecipitated hydrated metal-based filler, e.g., aluminum hydroxide ormagnesium hydroxide, preferably having about 99.4% purity. One exampleof such filler is Martinal® OL-104 LEO.41. The elongated article according to any preceding item, or elongatedarticle of any of items 1-40, wherein the coupling agent composition isa mixture of vinyltriethoxysilane and1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane.42. The elongated article according to any preceding item, or elongatedarticle of any of items 1-41, wherein the antioxidant is a phenolicantioxidant, preferablytetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxphenyl)propionate]methane.43. The elongated article according to any preceding item, or elongatedarticle of any of items 1-42, wherein the inner structure comprises from1 to 8 elements, each having diameters of up to 4.0 mm, such asdiameters from 0.5 to 4.0 mm, and preferably having from 2 to 5elements.44. The elongated article according to any preceding item, or elongatedarticle of any of items 1-43, wherein the polymer composition does notcontain a plasticizer.45. The elongated article according to any preceding item, or elongatedarticle of any of items 1-44, wherein the polymer composition does notcontain a high density polyethylene homopolymer having a density of 0.94g/cm³ or higher, preferably not containing a high density polyethylenehomopolymer having a density of 0.92 g/cm³ or higher.46. The elongated article according to any preceding item, or elongatedarticle of any of items 1-45, wherein the polymer composition does notcontain a polysiloxane.47. The elongated article according to any preceding item, or elongatedarticle of any of items 1-46, wherein the polymer composition surroundsthe inner structure to provide a sheath for mechanical protection of theinner structure.48. The elongated article according to any preceding item, or elongatedarticle of any of items 1-47, wherein, the glass transition temperatureof the polyolefin-elastomer/ultra-low density random ethylene-octenecopolymer is −58° C.49. The elongated article according to any preceding item, or elongatedarticle of any of items 1-48, wherein the polymer composition is not UVcrosslinked.50. The elongated article according to any preceding item, or elongatedarticle of any of items 1-49, having an MFI of at least 9 g/10 min,preferably 10-12 g/10 min, further preferred about 11 g/10 min, asmeasured according to EN ISO 1133 under the conditions at 150° C. andthe load of 21.6 kg.51. The elongated article according to any preceding item, or elongatedarticle of any of items 1-50, wherein the density of thepolyolefin-elastomer/ultra-low density random ethylene-octene copolymeris in the range from 0.80 g/cm³ to 0.90 g/cm³, as measured according toISO 1183.52. The elongated article according to any preceding item, or elongatedarticle of any of items 1-51, wherein the polymer composition has avalue of ShoreD hardness of 32-38.53. The elongated article according to any preceding item or elongatedarticle of any of items 1-52, wherein the linear very low densitypolyethylene (VLDPE) composition having a melting point above 110° C.,preferably has a melting point which is below 120° C. measured and/ordetermined by the method of DSC measurement.54. The elongated article according to any preceding item, or elongatedarticle of any of items 1-53, wherein the linear very low densitypolyethylene (VLDPE) composition has a Vicat temperature (Vicatsoftening temperature) of above 50° C., for example, measured toaccording to the ASTM D1525 method.55. The elongated article according to any preceding item, or elongatedarticle of any of items 1-54, which passes the alternate bending test(EN 50396).56. Polymer composition obtainable or obtained by compounding of atleast the components as defined in item 27 (ii).

In the context of the present invention, the “elongated article” can bean elongated device for conjunction and/or connection of two devices fortransferring electrical charges and/or information such as for powertransmission or telecommunications. For example, the “elongated article”can be a cable. In such an “elongated article”, the innerstructure/elements (which are surrounded by the polymer composition) caneach include an electric conductor as the static/moving current mediumor communication medium. The electric conductor is optionally itselfsurrounded by a shielding or sheathing, in particular a polymercomposition/coating, thereby forming the element. The electricalconductor can be a wire, preferably comprising or consisting of one ormore, e.g., 52, metal strands (e.g., copper strands), wherein the wireis optionally itself surrounded by a shielding or sheathing, therebyforming the element. The cable can, e.g., be used as low voltage cablesuch as for use in vacuum cleaner applications.

In the context of the present invention, the weight percentagesindicated for the components of the polymer composition are indicated asweight percentages based on the total weight of the polymer composition.

Linear very low density polyethylenes (VLDPEs) as used herein arehomopolymers.

In the context of the present invention, the “linear very low densitypolyethylene (VLDPE)”, “ultra-low density random ethylene-octenecopolymer (polyolefin-elastomer)” and any other polymer component can beused in the form of commercially available products. Since theseproducts may contain minor amounts of additives (e.g., antioxidants), inaddition to, e.g., pure polyethylene or ethylene-octene copolymer, theaforementioned terms, e.g., “linear very low density polyethylene(VLDPE)”, and “ultra-low density random ethylene-octene copolymer(polyolefin-elastomer)”, encompass compositions comprising such minoramounts of additives, e.g., amounts of additives of below 1.0 wt.-% orbelow 0.5 wt.-%. It can reasonably be expected that such minor amountsof additives do not have a significant impact on the final properties ofthe polymer composition.

In the context of the present invention, the parameters defined herein,in particular in the claims, can either be determined by testing theelongated article, the polymer composition, or the single/purecomponents of the polymer composition. A person skilled in the art candetermine the most feasible approach. For example, if the density of aVLDPE, which is present in the polymer composition of an elongatedarticle, is not known, the VLDPE may be extracted from the polymercomposition and analyzed. If the glass transition temperature or meltingpoint of a polyolefin-elastomer, which is present in the polymercomposition of an elongated article, is unknown, these parameters can bedetermined via DSC methods on the polymer composition.

As disclosed above, the invention relates to an elongated articlecomprising or consisting of (i) and (ii). The elongated article can beconfigured and can be used for connecting two devices for exchange ofcharges/information between the devices.

Component (i) is one or more elements including a static/moving chargemedium or communication medium. The one or more elements represent aninner structure. The elements/inner structure can have an elongated formwith two ends in order to, e.g., each have a length of up to severalkilometers. The elongated elements are aligned and are surrounded bycomponent (ii). Furthermore, the static/moving current medium orcommunication medium of each of the elements can itself be surrounded bya coat, e.g., polymer coat/composition, which provides a shielding orsheathing. The one or more optionally surrounded static/moving currentmedia or communication media together form component (i), i.e. the innerstructure. Component (ii) mechanically protects component (i). Duringuse of the elongated article, components (i) and (ii) may be subjectedto many bending movements and pull force. As explained above, theelongated articles disclosed herein may have sufficient flexibility toavoid breaking thereof even after a very long period of use (determinedby the alternate bending test).

Component (ii) is a halogen-free polymer composition/componentsurrounding the elements/inner structure, i.e., component (i). It is notexcluded, but less preferred, that there are additional coatings whicheither surround component (ii) or which are between components (i) and(ii).

The polymer composition is obtainable or obtained by compounding,preferably HFFR compounding, of at least the components defined incomponent (ii) above.

The linear very low density polyethylene (VLDPE) composition can containone or more types of a very low density polyethylene, and is preferablypresent in an amount of 24.0-26.5 wt.-%, further preferred 22.5-25.5wt.-%. It may have a density in the range from 0.86 g/cm³ to 0.93 g/cm³,as measured according to ISO 1183, and may have a melting point of above110° C. as determined by differential scanning calorimetry. Suchcommercially available polyethylenes are, e.g., Clearflex® MQF0 ofVersalis and Clearflex® CLDO of Polimeri Europa. One embodiment is19.5-21.8% of a first linear very low density polyethylene composition,3-5% of a second linear very low density polyethylene composition and9.5-12.0% of one polyolefin-elastomer with, e.g., 62.5-64.5%, e.g.,62.5%, 63%, 63.5 or 64.0% flame retardant filler, e.g., hydratedmetal-based filler/aluminum hydroxide, and optional components asdefined herein adding up to 100%. A further embodiment is 19.5-21.8%Clearflex® MQF0, 3-5% Clearflex® CLDO and 9.5-12.0% Engage 8842 with,e.g., 62.5-64.5%, e.g., 62.5%, 63.0%, 63.5 or 64.0% flame retardantfiller, e.g., hydrated metal-based filler/aluminum hydroxide, andoptional components as defined herein adding up to 100%.

The linear very low density polyethylene (VLDPE) composition having amelting point above 110° C., e.g., related to the differential scanningcalorimetry (DSC) measurement, preferably has a melting point which isbelow 120° C. as, e.g., also determined by differential scanningcalorimetry (DSC).

The linear very low density polyethylene (VLDPE) composition can have aVicat temperature (Vicat softening temperature) of above 50° C. forexample, measured according to the ASTM D1525 method.

The polyolefin-elastomer can comprise one or more different types ofpolyolefin-elastomers. The polyolefin-elastomer is preferably present inan amount of 9.5-13.0 wt.-%, further preferred 10.0-12.5 wt.-%, or10.0-11.5 wt.-%. The one or more polyolefin elastomers are ultra-lowdensity random ethylene-octane copolymers having a glass transitiontemperature of below −50° C. as determined by differential scanningcalorimetry, and a melting point of below 60° C. or below 50° C.,preferably below 40° C., as determined by differential scanningcalorimetry. Such commercially available polyolefin-elastomers areEngage® 8842, Engage® 8180, Engage® 8130, and Engage® 8150 of Dow.

The flame retardant filler is preferably present in an amount of 56-65wt.-% and is a mineral hydroxide/hydrated mineral. Preferably, thepolymer composition does not contain further polyethylene componentsand/or further polyolefin-elastomers.

Compounding of the polymer composition can be performed by mixing thecomponents in a molten state, e.g. in an Intermixer. A device which cansuitably be used for extrusion in this context is an extruder, e.g., atwin screw extruder, single screw kneading extruder.

The flame retardant filler or fillers used in the present invention arehalogen free. According to the present invention, mineral hydroxides,i.e., mineral fillers which are hydrated oxides can be used. Forexample, aluminum or magnesium hydroxides, can be used. When exposed tohigh temperatures, the mineral fillers decompose through endothermicreaction and release large quantities of water, so as to stop the flamepropagation. The flame retardant filler preferably is aluminumhydroxide, preferably fine precipitated aluminum hydroxide of about99.4% purity. One example of such filler is Martinal® OL-104 LEO ofAlbemarle.

Preferably, the flame retardant filler is used in an amount of 58-65wt.-%, or 60-65° wt.-%. In one embodiment, a combination of ClearflexMQF0, Clearflex CLDO and Engage® 8842 is used. In one embodiment, acombination of Clearflex CLDO and Flexomer™ DFDA-1137 NT 7 is used.

The polymer composition can further comprise 0.1-3.0 wt.-% of anantioxidant; and 0.5-2.5 wt.-% of a coupling agent composition.

The polymer composition preferably has

(aa) an elongation at break in the range from 150% to 500%, or 200% to400%, preferably from 300% to 500%, preferably 350% to 450%, or 340% to400%, as measured by IEC 60811-501, preferably before ageing andpreferably by using the elongated article without the inner structure,in particular an elongated article in the form of a hollow cable withconductors removed according to EN 50363-8, and/or,(bb) a strength at break in the range from 7.5 MPa to 15.0 MPa, or 5.5MPa to 12.0 MPa, preferably 8.0 MPa to 10.0 MPa, further preferred 9.0MPa to 10.0 MPa, as measured by IEC 60811-501. During ageing, thesamples are placed into an oven for 7 days at 80° C., then put into adesiccator and then tested. The deviation in elongation and tensilestrength is preferably not bigger than ±20%. Unless otherwise stated,all values referred to herein are measured without ageing.

The linear very low density polyethylene composition can comprise amixture of two different types of linear very low density polyethylenecompositions, preferably a mixture of 18-23 wt.-% of a first compositionhaving a density in the range from 0.85 g/cm³ to 0.95 g/cm³, preferablyof about 0.90 g/cm³, as measured according to ISO 1183, and 2.0-6.5wt.-% of a second composition having a density in the range from 0.85g/cm³ to 0.95 g/cm³, preferably of about 0.90 g/cm³, as measuredaccording to ISO 1183.

The linear very low density polyethylene composition can have a densityin the range from 0.85 g/cm³ to 0.92 g/cm³, preferably in the range from0.85 g/cm³ to 0.90 g/cm³, as measured according to ISO 1183.

The polyolefin-elastomer can have a density in the range from 0.80 g/cm³to 0.90 g/cm³, preferably of about 0.86 g/cm³, as measured according toASTM D792.

The polyolefin-elastomer composition used for preparing the polymercomposition (ii) can have an elongation at break of at least 1000%,further preferred at least 1100%, most preferably about 1200%, asmeasured by ASTMD638.

The polyolefin-elastomer can have a value of ShoreD hardness of lessthan 20, as measured by ASTM D2240 (compression molded sample).

The polymer composition can be applied by hot-melt extrusion at atemperature in the range from 100° C. up to 175° C., in a preferredembodiment of the invention in a range from 100° C. to 170° C.

The coupling agent composition can be a mixture of vinyltriethoxysilane(Dynasilan® VTEO of Evonik) and1,1-di(tert-butylperoxy)-3,3,5-trimethylcyclohexane (Trigonox 29-050 ofAkzoNobel).

The antioxidant can be a phenolic antioxidant, preferablytetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane (e.g., Irganox 1010 of BASF).

The inner structure of the elongated article and component (i) of theelongated article, respectively, can comprise from, e.g., 1 to 8elements, each preferably having a diameter of up to 4.0 mm, such asdiameters from 0.5 to 4.0 mm, and preferably having from 2 to 5elements. Preferably, the elements are elongated and/or stranded. Thestatic/moving current medium or communication medium of the elongatedelements is preferably surrounded by a polymer composition. Thestatic/moving current media or communication media can be wires, such ascopper wires, and can optionally be surrounded by an insulation/polymercomposition. The cross-section of each element without insulation, i.e.the cross-section of each of the static/moving current medium orcommunication medium, can for example be from 0.5 to 4.0 mm². Theelements, comprising the static/moving current medium or communicationmedium which are surrounded by a polymer composition, are brought incontact with and the polymer composition (ii) is then applied to theelements in an extrusion process. Preferably, the outer diameter of theelongated article is less than 6.2 mm. Preferably, the elongated articlehas a diameter so that it can include 2 elements, each comprising astatic/moving current medium or communication medium, e.g. an electricalconductor, which is surrounded by a polymer composition and each havinga cross-section, including the polymer composition, of 0.75 mm² or less,wherein the diameter of all 2 elements together is about 6 mm. In oneembodiment, the polymer composition does not contain a plasticizer.

In one embodiment, the polymer composition does not contain aplasticizer.

The polymer composition preferably does not contain a high densitypolyethylene homopolymer having a density of 0.94 g/cm³ or higher,preferably not containing a high density polyethylene homopolymer havinga density of 0.92 g/cm³ or higher.

The polymer composition preferably does not contain a polysiloxane. Thepolymer composition preferably does not contain a maleic anhydridegrafted polymer.

The polymer composition surrounds the inner structure to provideinsulation for mechanical protection of the inner structure as well asprotection of people from contact with electrical current. The polymercomposition surrounding the inner structure is preferably provided inthe form of a sheath. For example, the polymer composition coating theinner structure has a tubular shape.

The glass transition temperature of the polyolefin-elastomer/ultra-lowdensity random ethylene-octene copolymer preferably is −58° C. In oneembodiment, the density of the polyolefin-elastomer/ultra-low densityrandom ethylene-octene copolymer is in the range from 0.80 g/cm³ to 0.90g/cm³, as measured according to ISO 1183.

The polymer composition is preferably not UV crosslinked.

In one embodiment, the elongated article has an MFI of at least 9 g/10min, as measured according to EN ISO 1133 under the conditions at 150°C. and the load of 21.6 kg.

The invention also refers to a polymer composition obtainable orobtained by compounding at least the components of component (ii) asdescribed above. Further details of the polymer composition are alsodisclosed herein.

In one embodiment, the polymer composition has a ShoreD hardness of lessthan 32-38, as measured by ASTM D2240 (compression molded sample). Theaforementioned properties can, e.g., be determined by using the polymercomposition in the form of a hollow cable with conductors removedaccording to EN 50363-8.

The process for preparing an elongated article as disclosed herein maycomprise the steps of:

(i) providing an inner structure, preferably including one or moreelements including a static/moving current medium or communicationmedium;(ii) compounding the components of the polymeric composition and thenextrusion of the polymeric composition as described herein onto the oneor more elements; and(iii) obtaining said elongated article.

The step of compounding and extrusion is performed in two steps and indifferent devices: (iia) a compounding step, e.g. in a mixer, andafterwards (iib) the extrusion step in an extruder.

EXAMPLES

The following examples describe the present invention in detail, but arenot to be construed to be in any way limiting for the present invention.

VLDPE1 (Clearflex MQF0 of eni/versalis): Is a linear very low densitypolyethylene (VLDPE) having a density in the range from 0.85 g/cm³ to0.93 g/cm³, as measured according to ISO 1183, and having a meltingpoint of above 110° C. It has a melt flow index of 8-15 as determinedaccording to ASTM1238 (190° C./2.16 kg; g/10′).

VLDPE2 (Clearflex CLDO of Polimeri Europa, Eni): Is a linear very lowdensity polyethylene (VLDPE) having a density in the range from 0.85g/cm³ to 0.93 g/cm³, as measured according to ISO 1183, and having amelting point of above 110° C. It has a melt flow index of 2-5 asdetermined according to ASTM1238 (190° C./2.16 kg; g/10 min).

POE1 (Engage 8842, random octene copolymer): Is an ultra-low densityrandom ethylene-octene copolymer having a glass transition temperatureof below −50° C. and having a melting point of below 40° C.

POE2 (Exact8203 of ExxonMobil, block octene copolymer): Is an ultra-lowdensity random ethylene-octene copolymer having a glass transitiontemperature of below −50° C. and having to a melting point of below 40°C. The polymer has an MFI of 3.0 g/10 min, a density of 0.888 g/ccm, amelting point of 72° C., a glass transition temperature of <−75° C. anda Vicat softening point of 51° C.

POE3 (Engage HM7487 of the Dow Chemical Company, random octenecopolymer): Is an ultra-low density random ethylene-octene copolymerhaving a glass transition temperature of below −50° C. and having amelting point of below 40° C. The polymer has an MFI of <0.5 g/10 min, adensity of 0.862 g/ccm, a melting point of 37° C., a and a glasstransition temperature of <−57° C.

The test method and sample preparation for the measurement of theelongation is performed as with a sheathing material described in EN50363-8, wherein the elongated article without the one or moreelements/the elongated article without the inner structure is subjectedto the measurement.

The compositions in the examples were extruded into cables using a HFFRextruder, with HFFR extrusion head and HFFR screw, at a temperature inthe range from 100° C. up to 175° C. The process conditions can bechosen by a person skilled in the art.

Example-1 Composition 1

Composition 1 is characterized by a combination of a VLDPE (VLDPE1), inan amount of 25 wt.-% and a block octene copolymer (POE2) in an amountof 10 wt.-%. At a high filler level of ATH (aluminum hydroxide) of 63%,the elongation was below 300%.

Composition 1 25 % VLDPE1 10 % POE2 63 % ATH 1 % Antioxidant 1 %Coupling agent

The measured elongation was <300%. Composition 1 passed the alternatebending test, EN 50396.

Example-2 Composition 2

Composition 2 is characterized by a combination of two VLDPEs, i.e.,VLDPE1 and VLDPE2, in a total amount of 32 wt.-%. The two VLDPEs areused in combination with a block octene copolymer (POE2). An additionallow level of ATH (aluminum hydroxide) of 58% gives a high elongation.

Composition 2 24 % VLDPE1 8 % VLDPE2 8 % POE2 58 % ATH 1 % Antioxidant 1% Coupling agent

The measured elongation was >300%. Reducing the ATH level from 63% to58% reduces the flame retardancy.

Example-3 Composition 3

Composition 3 is characterized by a combination of two VLDPEs, i.e.,VLDPE1 and VLDPE2, in a total amount of 32 wt.-%. The two VLDPEs areused in combination with a random octene copolymer (POE3). Even at ahigh filler level of ATH (aluminum hydroxide) of 58%, a very highelongation was obtained.

Composition 3 24 % VLDPE1 8 % VLDPE2 8 % POE3 58 % ATH 1 % Antioxidant 1% Coupling agent

The measured elongation was >400%. A comparison between Compositions 2and 3 seems to confirm the concept underlying the present invention.That is, the specific combination and amounts of components provides thedesired elongation.

Example-4 Composition 4 (Comparative Example)

Composition 4 is characterized by a combination of two VLDPEs, i.e.,VLDPE1 and VLDPE2, in a total amount of 32 wt.-%. The two VLDPEs areused in combination with a propylene-based elastomer.

Composition 4 24 % VLDPE1 8 % VLDPE2 8 % Propylene-based elastomer(copolymer) 58 % ATH 1 % Antioxidant 1 % Coupling agent

The measured elongation was <300%. The measured tensile strength was<7.5 MPa. A comparison between Compositions 3 and 4 seems to suggestthat the use of a propylene-based elastomer does not provide a very highelongation.

Example-5 Composition 5 (Comparative Example)

Composition 5 is characterized by a combination of EVA (ethylene vinylacetate) in an amount of 16 wt.-%. The EVA is used in combination with ablock octene copolymer (POE2).

Composition 5 16 % EVA 15 % POE2 63 % ATH 1 % Antioxidant 5 % Couplingagent MAH-PE

The measured elongation was <300%. The composition failed the hotpressure test (80° C.>50%). A comparison between the above compositionsseems to suggest that the use of EVA does not provide a very highelongation and dimensional stability. Additionally, another couplingagent does not improve the properties.

Example-6 Composition 6 (Comparative Example)

Composition 6 is characterized by a combination of two VLDPEs, i.e.,VLDPE1 and VLDPE2, in a total amount of 28 wt.-%. The two VLDPEs areused in combination with an α-olefin copolymer.

Composition 6 21 % VLDPE1 7 % VLDPE2 7 % α-olefin copolymer (Vestoplast750) 63 % ATH 1 % Antioxidant 1 % Coupling agent

The measured elongation was <300%. A comparison between the abovecompositions seems to suggest that the use of a random ethylene-octenecopolymer is superior to the use of an α-olefin copolymer regardingelongation at break.

Composition 7 (Comparative Example)

Composition 7 is characterized by a combination of two VLDPEs, i.e.,VLDPE1 and VLDPE2, in a total amount of 20 wt.-%. The two VLDPEs areused in combination with an amorphous propylene-ethylene copolymer andPOE2.

Composition 7 16 % VLDPE1 4 % VLDPE2 10 % POE2 5 % Amorphous propylene-ethylene copolymer, Eastoflex 1060PL 63 % ATH 1 % Antioxidant 1 %Coupling agent

The measured elongation was >300%. The composition failed the hotpressure test (hot pressure test 80° C.>50%). The experiment seems toshow how changing the polymer compositions results in deterioration ofthe properties.

Composition 8

Composition 8 is characterized by a combination of two VLDPEs, i.e.,VLDPE1 and VLDPE2, in a total amount of 18 wt.-%. The two VLDPEs areused in combination with a random octene copolymer (POE3) in an amountof 17%.

Composition 8 14 % VLDPE1 4 % VLDPE2 17 % POE3 63 % ATH 1 % Antioxidant1 % Coupling agent

The measured elongation was >400%. The composition failed the hotpressure test (80° C.>50%). The example seems to suggest that the amountof POE was too high for mechanical stability at high temperatures butgood for elongation at break at room temperature.

Composition 9

Composition 9 is characterized by a combination of two VLDPEs, i.e.,VLDPE1 and VLDPE2, in a total amount of 23 wt.-%. The two VLDPEs areused in combination with a random octene copolymer in an amount of 13%.

Composition 9 20 % VLDPE1 3 % VLDPE2 13 % POE1 62 % ATH 1 % Antioxidant1 % Coupling agent

The measured elongation was >400%. The flexibility test was achievedwith a test elongated article.

Composition 10

Composition 10 is characterized by a combination of two VLDPEs, i.e.,VLDPE1 and VLDPE2, in a total amount of 30 wt.-%. The two VLDPEs areused in combination with a random octene copolymer (POE1) in an amountof 10%.

Composition 10 20 % VLDPE1 10 % VLDPE2 10 % POE1 58 % ATH 1 %Antioxidant 1 % Coupling agent

The measured elongation was >430%. With this formulation, theflexibility test can be achieved with an elongated article with threeinner elements, each having a cross-section of 1.5 mm².

CITED LITERATURE

EP1102282 A1

DE3633056 A1

WO 2010015876 A1

WO 2013030795 A1

WO 2002026879 A1

WO 2007032573 A1

WO 2008014597 A1 and

WO 2010024602 A2

1. Elongated article comprising: (i) one or more elements including amedium with static/moving charge/current or communication medium; and(ii) a halogen-free polymer composition surrounding the element(s),wherein said polymer composition is obtainable or obtained bycompounding and extrusion of at least the following components: (a)24-26.5 wt.-% of a linear very low density polyethylene (VLDPE)composition having a density in the range from 0.85 g/cm³ to 0.93 g/cm³,and having a melting point of above 110° C.; (b) 9.5-13 wt.-% of one ormore polyolefin-elastomers, wherein the polyolefin-elastomer(s) is/are(an) ultra-low density random ethylene-octene copolymer(s) having aglass transition temperature of below −50° C.; and (c) 61-66 wt.-% offlame retardant filler, which is a hydrated metal-based filler.
 2. Theelongated article according to claim 1, wherein the polymer compositionfurther comprises: (d) 0.1-3.0 wt.-% of an antioxidant; and (e) 0.5-2.5wt.-% of a coupling agent composition.
 3. The elongated articleaccording to claim 1, wherein the polymer composition has an elongationat break in the range from 200% to 350%, as measured by IEC 60811-501,measured by using the elongated article without the one or moreelements.
 4. The elongated article according to claim 1, wherein thelinear very low density polyethylene composition comprises a mixture oftwo different types of linear very low density polyethylenecompositions.
 5. The elongated article according to claim 1, wherein thepolyolefin-elastomer has a density in the range from 0.80 g/cm³ to 0.90g/cm³, as measured according to ASTM D792.
 6. The elongated articleaccording to claim 1, wherein the polyolefin-elastomer has a value ofShoreD hardness of less than 20, as measured by ASTM D2240.
 7. Theelongated article according to claim 1, wherein the flame retardantfiller is fine precipitated hydrated metal-based filler.
 8. Theelongated article according to claim 1 comprising from 1 to 3 elementsand the elongated article has an outer diameter of less than 6.2 mm. 9.The elongated article according to claim 1, wherein the polymercomposition does not contain a high density polyethylene homopolymerhaving a density of 0.94 g/cm³ or higher.
 10. The elongated articleaccording to claim 1, wherein, the glass transition temperature of thepolyolefin-elastomer/ultra-low density random ethylene-octene copolymeris −58° C.
 11. The elongated article according to claim 1, wherein thedensity of the polyolefin-elastomer/ultra-low density randomethylene-octene copolymer is in the range from 0.80 g/cm³ to 0.90 g/cm³,as measured according to ISO
 1183. 12. The elongated article accordingto claim 1, wherein the linear very low density polyethylene (VLDPE)composition has a melting point above 110° C.
 13. The elongated articleaccording to claim 1, which passes the alternate bending test (EN 50396)with 30,000 cycles.
 14. Polymer composition obtainable or obtained bycompounding and extrusion of at least the components (a)-(c) as definedin claim
 1. 15. Elongated article, comprising: (i) an inner structure;and (ii) a polymer composition surrounding the inner structure, whereinthe polymer composition comprises a mixture of a linear very low densitypolyethylene (VLDPE) composition, a polyolefin-elastomer, which is anultra-low density random ethylene-octene copolymer, a mineralhydroxide/hydrated metal-based filler flame retardant filler, anantioxidant and a coupling agent composition; and wherein the polymercomposition has (aa) an elongation at break in the range from 150% to500%, as measured by IEC 60811-501; and (bb) a strength at break in therange from 7.5 MPa to 15.0 MPa, as measured by IEC 60811-501.
 16. Theelongated article according to claim 15, wherein the polymer compositionis as defined in claim
 1. 17. The elongated article according to claim15, wherein the inner structure comprises from 1 to 8 elements, eachhaving diameters of up to 4.0 mm.
 18. The elongated article according toclaim 1, wherein the polymer composition does not contain a plasticizer.19. The elongated article according to claim 1, wherein the polymercomposition does not contain a polysiloxane.
 20. The elongated articleaccording to claim 1, wherein the polymer composition is not UVcrosslinked.
 21. The elongated article according to claim 1, wherein thepolymer composition has a strength at break in the range from 5.5 MPa to12.0 MPa, as measured by IEC 60811-501.
 22. The elongated articleaccording to claim 1, wherein the linear very low density polyethylenecomposition comprises a mixture of two different types of linear verylow density polyethylene compositions, which is a mixture of 18-23 wt.-%of a first composition, having a density in the range from 0.85 g/cm³ to0.95 g/cm³, as measured according to ISO 1183, and 2.0-6.5 wt.-% of asecond composition, having a density in the range from 0.85 g/cm³ to0.95 g/cm³, as measured according to ISO 1183.